In solving questions , answer never match in decimals. Like sometimes its .4 or .5 differences. I put whole Equation in Ax^b equation in calculator with brackets and all. But the final answer is always different in decimals. Absolute figure is always right.
I am afraid if the answer would be 20.8 , Then i would get 21 and something in decimals.
If it is a question that required you to type in the answer, then either it will specify the number of decimal places to use or else the computer will be programmed to accept a range of answers.